_STP_559-1974.pdf

FRACTURE TOUGHNESS AND SLOW-STABLE CRACKING Proceedings of the 1973 National Symposium on Fracture Mechanics,Part I A symposium sponsored by Committee E-24 on Fracture Testing of Metals,AMERICAN SOCIETY FOR TESTING AND MATERIALS University of Maryland,College Park,Md.,27-29 Aug.1973 ASTM SPECIAL TECHNICAL PUBLICATION 559 P.C.Paris,chairman of symposium committee G.R.Irwin,general chairman of symposium List price$25.25 04-559000-30(l AMERICAN SOCIETY FOR TESTING AND MATERIALS 1916 Race Street,Philadelphia,Pa.19103()AMERICAN SOCIETY FOR TESTING AND MATERIALS 1974 Library of Congress Catalog Card Number:74-81154 NOTE Thc Society is not responsible,as a body,for the statements and opinions advanced in this publication.Printed in Baltimore,Md.August 1974 Foreword The 1973 National Symposium on Fracture Mechanics was held at the University of Maryland Conference Center,College Park,Md.,27-29 Aug.1973.The symposium was sponsored by the American Society for Testing and Materials through Committee E-24 on Fracture Testing of Metals.Members of the Symposium Subcommittee of Committee E-24 selected papers for the program.Organizational assistance from Don Wisdom and Jane Wheeler at ASTM Headquarters was most helpful.G.R.Irwin,Dept.of Mechanical Engineering,University of Maryland,served as general chairman.Those who served as session chairmen were H.T.Corten,Dept.of Theoretical and Applied Mechanics,University of Illinois;C.M.Carman,Frankford Arsenal;J.R.Rice,Div.of Engineer-ing,Brown University;D.E.McCabe,Research Dept.,ARMCO Steel;J.E.Srawley,Fracture Section,Lewis Research Center,NASA;E.T.Wessel,Research and Development Center,Westinghouse Electric Corp.;and E.K.Walker,Lockheed-California Co.The Proceedings have been divided into two volumes:Part 1-Fracture Toughness and Slow-Stable Cracking and Part II-Fracture Analysis.Related ASTM Publications Stress Analysis and Growth of Cracks,STP 513(1972),$27.50 04-513000-30 Fracture Toughness,STP 514(1972),$18.75 04-514000-30 Fracture Toughness Evaluation by R-Curve Methods,STP 527(1973),$9.75 04-527000-30 Progress in Flaw Growth and Fracture Toughness Testing,STP 536(1973),$33.25 04-536000-30 Copyright by ASTM Intl(all rights reserved);Mon Dec 7 13:10:55 EST 2015Downloaded/printed byUniversity of Washington(University of Washington)pursuant to License Agreement.No further reproductions authorized.Contents Introduction 1 Fracture Toughness Test Methods for Abrasion-Resistant White Cast Irons Using Compact Specimens-D.E.DIESBUR6 3 Experimental Procedure 5 Results and Discussion 6 Conclusions 13 Development of Fast Fracture in a Low Alloy Steel-J.c.RADON AND A.A.POLLOCK 15 Material,Specimen Geometry,and Fracture Mechanics Results 16 Acoustic Emission 19 Fractography 25 Discussion 27 Conclusions 29 Acoustic Emission from 4340 Steel During Stress Corrosion Cracking-H.H.CHASKELIS,W.H.CULLEN,AND J.M.KRAFFT 31 Experimental Procedures 32 Data Reduction 35 Comparison of Acoustic Emission to Crack Growth 36 Comparison of Acoustic Emission to the Fracturing Process 36 Discussion 42 Conclusions 43 Effects of Shot-Peening Residual Stresses on the Fracture and Crack-Growth Properties of D6AC Steel-WOLF ELBER 45 Nomenclature 45 Residual Stress Model 47 Experiments 50 Results and Discussion 53 Conclusion 57 Fracture Properties of a Cold-Worked Mild Steel-E,J.RIFLING Materials and Procedure Results and Discussion Conclusions 59 60 62 72 More on Specimen Size Effects in Fracture Toughness TestingJ.6.KAUFMAN AND F.G.NELSON 74 Material 75 Procedure 75 Results 79 Discussion 79 Implications in Size Requirements 83 Value of Kma x 85 Summary 85 Dynamic Compact Tension Testing for Fracture Toughness-P.c.pARIS,R.3.BUCCI AND L.L.LOUSltIN 86 Alloys 88 Experimentation 89 Equipment and Instrumentation 91 Test Records 93 Analysis of Test Records 96 Summary 98 Further Aspects of Fracture Resistance Measurement on Thin Sheet Ma-terial:Yield Stress and Crack LengthwA.M.SULLIVAN ANt)STOOP 99 Experimental Parameters 101 Degradation of K e with Increased Yield Strength 103 Relationship Between Initial and Final Crack Length 104 Screening Specimen 109 Conclusions 109 Further Studies of Crack Propagation Using the Controlled Crack Propa-gation Approach-R.H.WEITZMANN AND I.FINNIE 111 Results and Discussion 117 General Test Aspects 124 Conclusions 125 Double Torsion Technique as a Universal Fracture Toughness Test Method-J.o.OUTWATER,M.C.MURPHY,R.G.KUMBLE,AND J.T.BERRY 127 Fundamental Concepts of Fracture Mechanics 128 Theoretical and Experimental Limitations 129 Theoretical Basis for the Double Torsion Technique 130 Experimental Procedure and Results 133 Discussion 135 Conclusions 136 Authors Note Added in Proof 137 Measurement of KIe on Small Specimens Using Critical Crack Tip Open-ing Displacement-J.N.ROBINSON AND A.S.TETELMAN 139 Experimental Procedure 141 Results and Discussion 146 Summary 156 Correlation Between Fatigue Crack Propagation and Low Cycle Fatigue Properties-SAURINDRANATH MAJUMDAR AND JODEAN MORRO